So this error here reads the following
SELECT count(*) as rows FROM sessions WHERE running_time > 1515103720
In readable human format
SELECT Everything (Count it first) as rows FROM sessions WHERE running_time is GREATER THEN > GMT: Thursday, January 4, 2018 10:08:40 PM
Check your date and time first. or the server date and time.
You could also look for the sessions in the database and remove it, so you don't have any running sessions